Final answer:
Marx and Engels argued that workers should unite against the bourgeoisie in 'The Communist Manifesto', foreseeing the end of capitalism to be replaced by communism, through a socially owned means of production and a classless society.
Step-by-step explanation:
In The Communist Manifesto, authored by Karl Marx and Friedrich Engels, they did not argue that capitalism is the best economic system, or that feudalism should be revived, or that monarchy is the ideal form of government. Instead, their central argument was that workers should unite against the bourgeoisie. Marx and Engels described a history of class struggles and predicted that the exploitation inherent in the capitalist system would eventually lead to a revolution, where the proletariat would overthrow the bourgeoisie. This revolution was seen as a step towards socialism, and ultimately a classless society under communism, where the means of production would be communally owned.
The manifesto called for a forcible overthrow of all existing social conditions, which was embraced by many as a declaration of war on the capitalist system that they believed exploited workers severely. Marx's work sparked a new era of revolutionary thought, aiming for a society free from the class conflicts that Marxism identifies as the root of societal issues.